Process for forming finger-rings



E. E. BROSS.

PROCESS FOR FORMING FINGER RINGS.

1,360,719. PatentedNov. 30,1920.

Rim/s 0 REM formed. Fig. 2 is sheet of metal having a ERNEST E. BROSS, OF DETROIT, MICHIGAN,

ASSIGNOB TO THE TRAUB MANUFACTUR- ING COMPANY, OF DE'IROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

PROCESS FOR FORMING FINGER-RINGS.

Specification of Letters Patent.

Patented Nov. 30, 1920.

Application filed March 1, 1920. Serial No. 362,413.

T 0 all whom it may concern:

Be it known that I, ERNEST E. Bnoss, a citizen of the United States, and residing at Detroit, in the county of Wayne and State of Michigan, have invented a new and Improved Process for Forming Finger Rings, of which the following is a specification.

This invention relates to the manufacture of finger rings in which a shell of one metal overlies or incloses a body of another metal, and its object is a process forthe construction of rings of this character consisting in first forming the shell properly embossed of one metal, and then filling it with the second metal.

The process for forming rings which forms the subject matterof this application annular shell from a high melting point by drawing and spinning and then filling the shell with'a metal having a lower melting point.

It also consists in forming the shell U- shaped in cross section and then embossing it by means of rollers, after which the shell is filled with a metal having a lower melting point.

It further consists in the several steps set forth in the following description and particularly pointed out in the claims.

In the drawing, Figure 1 is a plan of a circular blank from which the shell is to be a view of the blank after being drawn and punched. Fig. 3 is a central section of-the blank after it has been rounded. Fig. 4 is a side elevation of 'a female embossing roll. Fig. 5 is a section on the line 5--5 of Fig. 4. Fig. 6 is a side elevation of a male embossing roll. Fig. 7 is a section on the line 7-7 of Fig. 6 on a larger scale. Fig. 8 is a development of the engaging surfaces of these rolls as well as of the finished shell. Fig. 9 is a view illustrating the manner of filling the shell and Fig. 10 is a cross section thereof after being filled, on a larger scale. Fig. 11 is a cross section of a finished ring on a large scale.

The present process is adapted to produce finger rings having an exterior shell of any desired thickness of a precious metal such as platinum or gold and a filling or body of a metal having a lower melting point than the shell. Thus gold may be used to fill a platinum shell and silver to fill both platinum and gold shells. Silver is quite desirable as consists in forming an proper holder a body for rings having platinum shells as the surface thereof which is not covered by the platinum is next to the finger and kept bright by friction.

A thin disk 1, such as shown in Fig. 1, is "irst drawn and then perforated to form the cylindrical ring 2 and flange 3'shown in Fig. 2. This blank is then placed in a and spun down to produce the shell 4 which is U-shaped in cross section.

A pair of rolls 5 and 6 may be employed to emboss the shell, the roll 5 having a groove 7 which has the desired pattern cut into its bottom wall, while the roll 6 has a circumferential flange 8 which has its periphery similarly embossed. Fig. 8 shows a development of the shell 4 after it has been acted upon by these rolls.

After the shell has been properly prepared, whether embossed or not, it is filled with a melted metal having a lower melting point. This may be done by melting a rod 10 of the metal having a lower melting point than the shell, preferably by means of an oXy-acetylene flame 11, the melted metal flowing into the shell 4 as shown in Fig. 9, until a body 12 such as shown in Fig. 10 is produced. The ring is then finished by burnishing or cutting to produce the cross section shown in Fig. 11.

By using the process above described, the objectionable solder lines which occur when the shells are stamped out as straight troughs and thereafter bent and their ends joined, are obviated. These lines are particularly noticeable in platinum shells for the solder becomes black.

I claim':

1. The process of forming finger rings which consists in drawing and bending a disk of metal to form an annular shell which is substantially Ushaped in cross section, filling, the shell with metal which has a lower melting point than the metal of the shell and then finishing the ring.

2. The process of forming finger rings which consists in drawing and bending a disk of metal to form an annular shell which is substantially U-shaped in cross section, rolling the shell between embossing rolls to form a pattern on the shell, filling the shell with metal which has a lower melting point than the metal of the shell and then finishing the shell.

- ERNEST E. BROSS. 

